Question

Assertion :The current through $4\Omega$ resistor of the circuit shown, just after closing the key K is $1A$, but after a long time, it reduces to almost zero. Reason: The lnductor opposes any change in current in the circuit, whereas the resistor opposes the current (flow of charge) itself in the circuit.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

At $t=0^{+}$(just closing key K), inductor behaves like open circuit.

$\therefore currnetI=\frac{6}{6}=1A$

For $t\to \infty$(after a long time), inductor behaves like short circiut. Hence almost all current flow through inductor.Thus, current through 4$\Omega$ resistor is almost zero.